gcloud compute backend-services update

gcloud compute backend-services update - update a backend service

gcloud compute backend-services update BACKEND_SERVICE_NAME [--affinity-cookie-ttl=AFFINITY_COOKIE_TTL] [--cache-key-include-host] [--cache-key-include-http-header=[HEADER_FIELD_NAME,…]] [--cache-key-include-named-cookie=[NAMED_COOKIE,…]] [--cache-key-include-protocol] [--cache-key-include-query-string] [--cache-mode=CACHE_MODE] [--compression-mode=COMPRESSION_MODE] [--connection-drain-on-failover] [--connection-draining-timeout=CONNECTION_DRAINING_TIMEOUT] [--connection-persistence-on-unhealthy-backends=CONNECTION_PERSISTENCE_ON_UNHEALTHY_BACKENDS] [--description=DESCRIPTION] [--drop-traffic-if-unhealthy] [--edge-security-policy=EDGE_SECURITY_POLICY] [--[no-]enable-cdn] [--[no-]enable-logging] [--[no-]enable-strong-affinity] [--failover-ratio=FAILOVER_RATIO] [--health-checks=HEALTH_CHECK,[…]] [--no-health-checks] [--http-health-checks=HTTP_HEALTH_CHECK,[…]] [--https-health-checks=HTTPS_HEALTH_CHECK,[…]] [--iap=disabled|enabled,[oauth2-client-id=OAUTH2-CLIENT-ID,oauth2-client-secret=OAUTH2-CLIENT-SECRET]] [--idle-timeout-sec=IDLE_TIMEOUT_SEC] [--logging-sample-rate=LOGGING_SAMPLE_RATE] [--port-name=PORT_NAME] [--protocol=PROTOCOL] [--[no-]request-coalescing] [--security-policy=SECURITY_POLICY] [--session-affinity=SESSION_AFFINITY] [--signed-url-cache-max-age=SIGNED_URL_CACHE_MAX_AGE] [--subsetting-policy=SUBSETTING_POLICY; default="NONE"] [--timeout=TIMEOUT] [--tracking-mode=TRACKING_MODE] [--bypass-cache-on-request-headers=BYPASS_CACHE_ON_REQUEST_HEADERS     | --no-bypass-cache-on-request-headers] [--cache-key-query-string-blacklist=[QUERY_STRING,…]     | --cache-key-query-string-whitelist=QUERY_STRING,[…]] [--client-ttl=CLIENT_TTL     | --no-client-ttl] [--custom-request-header=CUSTOM_REQUEST_HEADER     | --no-custom-request-headers] [--custom-response-header=CUSTOM_RESPONSE_HEADER     | --no-custom-response-headers] [--default-ttl=DEFAULT_TTL     | --no-default-ttl] [--global     | --region=REGION] [--global-health-checks     | --health-checks-region=HEALTH_CHECKS_REGION] [--max-ttl=MAX_TTL     | --no-max-ttl] [--[no-]negative-caching     | --no-negative-caching-policies     | --negative-caching-policy=[[CODE=TTL],…]] [--serve-while-stale=SERVE_WHILE_STALE     | --no-serve-while-stale] [--service-bindings=SERVICE_BINDING,[…]     | --no-service-bindings] [GCLOUD_WIDE_FLAG …]

BACKEND_SERVICE_NAME

Name of the backend service to update.

--affinity-cookie-ttl=AFFINITY_COOKIE_TTL

If session-affinity is set to "generated_cookie", this flag sets the TTL, in seconds, of the resulting cookie. A setting of 0 indicates that the cookie should be transient. See $ gcloud topic datetimes for information on duration formats.

--cache-key-include-host

Enable including host in cache key. If enabled, requests to different hosts will be cached separately. Can only be applied for global resources.

--cache-key-include-http-header=[HEADER_FIELD_NAME,…]

Specifies a comma-separated list of HTTP headers, by field name, to include in cache keys. Only the request URL is included in the cache key by default.

--cache-key-include-named-cookie=[NAMED_COOKIE,…]

Specifies a comma-separated list of HTTP cookie names to include in cache keys. The name=value pair are used in the cache key Cloud CDN generates. Cookies are not included in cache keys by default.

--cache-key-include-protocol

Enable including protocol in cache key. If enabled, http and https requests will be cached separately. Can only be applied for global resources.

--cache-key-include-query-string

Enable including query string in cache key. If enabled, the query string parameters will be included according to --cache-key-query-string-whitelist and --cache-key-query-string-blacklist. If disabled, the entire query string will be excluded. Use "--cache-key-query-string-blacklist=" (sets the blacklist to the empty list) to include the entire query string. Can only be applied for global resources.

--cache-mode=CACHE_MODE

Specifies the cache setting for all responses from this backend. CACHE_MODE must be one of:

CACHE_ALL_STATIC

Automatically cache static content, including common image formats, media (video and audio), web assets (JavaScript and CSS). Requests and responses that are marked as uncacheable, as well as dynamic content (including HTML), aren't cached.

FORCE_CACHE_ALL

Cache all content, ignoring any "private", "no-store" or "no-cache" directives in Cache-Control response headers. Warning: this may result in Cloud CDN caching private, per-user (user identifiable) content. You should only enable this on backends that are not serving private or dynamic content, such as storage buckets.

USE_ORIGIN_HEADERS

Require the origin to set valid caching headers to cache content. Responses without these headers aren't cached at Google's edge, and require a full trip to the origin on every request, potentially impacting performance and increasing load on the origin server.

--compression-mode=COMPRESSION_MODE

Compress text responses using Brotli or gzip compression, based on the client's Accept-Encoding header. Two modes are supported: AUTOMATIC (recommended) - automatically uses the best compression based on the Accept-Encoding header sent by the client. In most cases, this will result in Brotli compression being favored. DISABLED - disables compression. Existing compressed responses cached by Cloud CDN will not be served to clients. COMPRESSION_MODE must be one of: DISABLED, AUTOMATIC.

--connection-drain-on-failover

Connection drain is enabled by default and on failover or failback connections will be drained. If connection drain is disabled, the existing connection state will be cleared immediately on a best effort basis on failover or failback, all connections will then be served by the active pool of instances. Not compatible with the --global flag, load balancing scheme must be INTERNAL or EXTERNAL, and the protocol must be TCP.

--connection-draining-timeout=CONNECTION_DRAINING_TIMEOUT

Connection draining timeout to be used during removal of VMs from instance groups. This guarantees that for the specified time all existing connections to a VM will remain untouched, but no new connections will be accepted. Set timeout to zero to disable connection draining. Enable feature by specifying a timeout of up to one hour. If the flag is omitted API default value (0s) will be used. See $ gcloud topic datetimes for information on duration formats.

--connection-persistence-on-unhealthy-backends=CONNECTION_PERSISTENCE_ON_UNHEALTHY_BACKENDS

Specifies connection persistence when backends are unhealthy. The default value is DEFAULT_FOR_PROTOCOL. CONNECTION_PERSISTENCE_ON_UNHEALTHY_BACKENDS must be one of: DEFAULT_FOR_PROTOCOL, NEVER_PERSIST, ALWAYS_PERSIST.

--description=DESCRIPTION

An optional, textual description for the backend service.

--drop-traffic-if-unhealthy

Enable dropping of traffic if there are no healthy VMs detected in both the primary and backup instance groups. Not compatible with the --global flag. Applicable only for backend service-based network load balancers and internal TCP/UDP load balancers as part of a connection tracking policy. For details, see: Connection persistence on unhealthy backends for internal TCP/UDP load balancing and Connection persistence on unhealthy backends for network load balancing.

--edge-security-policy=EDGE_SECURITY_POLICY

The edge security policy that will be set for this backend service. To remove the policy from this backend service set the policy to an empty string.

--[no-]enable-cdn

Enable or disable Cloud CDN for the backend service. Only available for backend services with --load-balancing-scheme=EXTERNAL that use a --protocol of HTTP, HTTPS, or HTTP2. Cloud CDN caches HTTP responses at the edge of Google's network. Cloud CDN is disabled by default. Use --enable-cdn to enable and --no-enable-cdn to disable.

--[no-]enable-logging

The logging options for the load balancer traffic served by this backend service. If logging is enabled, logs will be exported to Cloud Logging. Disabled by default. This field cannot be specified for SSL Proxy and TCP Proxy Load Balancing. Use --enable-logging to enable and --no-enable-logging to disable.

--[no-]enable-strong-affinity

Enable or disable strong session affinity. This is only available for loadbalancingScheme EXTERNAL. Use --enable-strong-affinity to enable and --no-enable-strong-affinity to disable.

--failover-ratio=FAILOVER_RATIO

If the ratio of the healthy VMs in the primary backend is at or below this number, traffic arriving at the load-balanced IP will be directed to the failover backend(s). Not compatible with the --global flag.

--health-checks=HEALTH_CHECK,[…]

Specifies a list of health check objects for checking the health of the backend service. Currently at most one health check can be specified. Health checks need not be for the same protocol as that of the backend service.

--no-health-checks

Removes all health checks for the backend service if the backend service has no backends attached.

--http-health-checks=HTTP_HEALTH_CHECK,[…]

Specifies a list of legacy HTTP health check objects for checking the health of the backend service.

Legacy health checks are not recommended for backend services. It is possible to use a legacy health check on a backend service for a HTTP(S) load balancer if that backend service uses instance groups. For more information, refer to this guide: https://cloud.google.com/load-balancing/docs/health-check-concepts#lb_guide.

--https-health-checks=HTTPS_HEALTH_CHECK,[…]

Specifies a list of legacy HTTPS health check objects for checking the health of the backend service.

Legacy health checks are not recommended for backend services. It is possible to use a legacy health check on a backend service for a HTTP(S) load balancer if that backend service uses instance groups. For more information, refer to this guide: https://cloud.google.com/load-balancing/docs/health-check-concepts#lb_guide.

--iap=disabled|enabled,[oauth2-client-id=OAUTH2-CLIENT-ID,oauth2-client-secret=OAUTH2-CLIENT-SECRET]

Change the Identity Aware Proxy (IAP) service configuration for the backend service. You can set IAP to 'enabled' or 'disabled', or modify the OAuth2 client configuration (oauth2-client-id and oauth2-client-secret) used by IAP. If any fields are unspecified, their values will not be modified. For instance, if IAP is enabled, '--iap=disabled' will disable IAP, and a subsequent '--iap=enabled' will then enable it with the same OAuth2 client configuration as the first time it was enabled. See https://cloud.google.com/iap/ for more information about this feature.

--idle-timeout-sec=IDLE_TIMEOUT_SEC

Specifies how long to keep a connection tracking table entry while there is no matching traffic (in seconds). Applicable only for backend service-based network load balancers and internal TCP/UDP load balancers as part of a connection tracking policy.

--logging-sample-rate=LOGGING_SAMPLE_RATE

This field can only be specified if logging is enabled for the backend service. The value of the field must be a float in the range [0, 1]. This configures the sampling rate of requests to the load balancer where 1.0 means all logged requests are reported and 0.0 means no logged requests are reported. The default value is 1.0 when logging is enabled and 0.0 otherwise.

--port-name=PORT_NAME

Backend services for external HTTP(S) load balancing, internal HTTP(S) load balancing, TCP proxy load balancing, and SSL proxy load balancing must reference exactly one named port if using instance group backends.

Each instance group backend exports one or more named ports, which map a user-configurable name to a port number. The backend service's named port subscribes to one named port on each instance group. The resolved port number can differ among instance group backends, based on each instance group's named port list.

When omitted, a backend service subscribes to a named port called http.

The named port for a backend service is either ignored or cannot be set for these load balancing configurations:

• For any load balancer, if the backends are not instance groups (for example, GCE_VM_IP_PORT NEGs).
• For any type of backend on a backend service for internal TCP/UDP load balancing or external TCP/UDP network load balancing.

See also https://cloud.google.com/load-balancing/docs/backend-service#named_ports.

--protocol=PROTOCOL

Protocol for incoming requests.

If the load-balancing-scheme is INTERNAL (Internal TCP/UDP Load Balancing), the protocol must be one of: TCP, UDP, UNSPECIFIED.

If the load-balancing-scheme is INTERNAL_SELF_MANAGED (Traffic Director), the protocol must be one of: HTTP, HTTPS, HTTP2, GRPC.

If the load-balancing-scheme is INTERNAL_MANAGED (Internal HTTP(S) Load Balancing), the protocol must be one of: HTTP, HTTPS, HTTP2.

If the load-balancing-scheme is EXTERNAL and region is not set (HTTP(S), SSL Proxy, or TCP Proxy Load Balancing), the protocol must be one of: HTTP, HTTPS, HTTP2, SSL, TCP.

If the load-balancing-scheme is EXTERNAL and region is set (External Network Load Balancing), the protocol must be one of: TCP, UDP, UNSPECIFIED.

If the load-balancing-scheme is EXTERNAL_MANAGED (Envoy based External HTTP(S) Load Balancing), the protocol must be one of: HTTP, HTTPS, HTTP2.

--[no-]request-coalescing

Enables request coalescing to the backend (recommended).

Request coalescing (or collapsing) combines multiple concurrent cache fill requests into a small number of requests to the origin. This can improve performance by putting less load on the origin and backend infrastructure. However, coalescing adds a small amount of latency when multiple requests to the same URL are processed, so for latency-critical applications it may not be desirable.

Defaults to true.

Use --request-coalescing to enable and --no-request-coalescing to disable.

--security-policy=SECURITY_POLICY

The security policy that will be set for this backend service.

--session-affinity=SESSION_AFFINITY

The type of session affinity to use. Supports both TCP and UDP. SESSION_AFFINITY must be one of:

CLIENT_IP

Route requests to instances based on the hash of the client's IP address.

CLIENT_IP_NO_DESTINATION

Directs a particular client's request to the same backend VM based on a hash created on the client's IP address only. This is used in L4 ILB as Next-Hop scenarios. It differs from the Client-IP option in that Client-IP uses a hash based on both client-IP's address and destination address.

CLIENT_IP_PORT_PROTO

(Applicable if --load-balancing-scheme is INTERNAL) Connections from the same client IP with the same IP protocol and port will go to the same backend VM while that VM remains healthy.

CLIENT_IP_PROTO

(Applicable if --load-balancing-scheme is INTERNAL) Connections from the same client IP with the same IP protocol will go to the same backend VM while that VM remains healthy.

GENERATED_COOKIE

(Applicable if --load-balancing-scheme is INTERNAL_MANAGED, INTERNAL_SELF_MANAGED, EXTERNAL_MANAGED, or EXTERNAL) If the --load-balancing-scheme is EXTERNAL or EXTERNAL_MANAGED, routes requests to backend VMs or endpoints in a NEG, based on the contents of the GCLB cookie set by the load balancer. Only applicable when --protocol is HTTP, HTTPS, or HTTP2. If the --load-balancing-scheme is INTERNAL_MANAGED or INTERNAL_SELF_MANAGED, routes requests to backend VMs or endpoints in a NEG, based on the contents of the GCILB cookie set by the proxy. (If no cookie is present, the proxy chooses a backend VM or endpoint and sends a Set-Cookie response for future requests.) If the --load-balancing-scheme is INTERNAL_SELF_MANAGED, routes requests to backend VMs or endpoints in a NEG, based on the contents of a cookie set by Traffic Director. This session affinity is only valid if the load balancing locality policy is either RING_HASH or MAGLEV.

HEADER_FIELD

(Applicable if --load-balancing-scheme is INTERNAL_MANAGED, EXTERNAL_MANAGED, or INTERNAL_SELF_MANAGED) Route requests to backend VMs or endpoints in a NEG based on the value of the HTTP header named in the --custom-request-header flag. This session affinity is only valid if the load balancing locality policy is either RING_HASH or MAGLEV and the backend service's consistent hash specifies the name of the HTTP header.

HTTP_COOKIE

(Applicable if --load-balancing-scheme is INTERNAL_MANAGED, EXTERNAL_MANAGED or INTERNAL_SELF_MANAGED) Route requests to backend VMs or endpoints in a NEG, based on an HTTP cookie named in the HTTP_COOKIE flag (with the optional --affinity-cookie-ttl flag). If the client has not provided the cookie, the proxy generates the cookie and returns it to the client in a Set-Cookie header. This session affinity is only valid if the load balancing locality policy is either RING_HASH or MAGLEV and the backend service's consistent hash specifies the HTTP cookie.

NONE

Session affinity is disabled.

--signed-url-cache-max-age=SIGNED_URL_CACHE_MAX_AGE

The amount of time up to which the response to a signed URL request will be cached in the CDN. After this time period, the Signed URL will be revalidated before being served. Cloud CDN will internally act as though all responses from this backend had a Cache-Control: public, max-age=[TTL] header, regardless of any existing Cache-Control header. The actual headers served in responses will not be altered.

For example, specifying 12h will cause the responses to signed URL requests to be cached in the CDN up to 12 hours. See $ gcloud topic datetimes for information on duration formats.

This flag only affects signed URL requests.

--subsetting-policy=SUBSETTING_POLICY; default="NONE"

Specifies the algorithm used for subsetting. Default value is NONE which implies that subsetting is disabled. For Layer 4 Internal Load Balancing, if subsetting is enabled, only the algorithm CONSISTENT_HASH_SUBSETTING can be specified. SUBSETTING_POLICY must be one of: NONE, CONSISTENT_HASH_SUBSETTING.

--timeout=TIMEOUT

Applicable to all load balancing products except Internal TCP/UDP Load Balancing and External TCP/UDP Network Load Balancing. For Internal TCP/UDP Load Balancing (load-balancing-scheme set to INTERNAL) and External TCP/UDP Network Load Balancing (global not set and load-balancing-scheme set to EXTERNAL), timeout is ignored.

If the protocol is HTTP, HTTPS, or HTTP2, timeout is a request/response timeout for HTTP(S) traffic, meaning the amount of time that the load balancer waits for a backend to return a full response to a request. If WebSockets traffic is supported, the timeout parameter sets the maximum amount of time that a WebSocket can be open (idle or not).

For example, for HTTP, HTTPS, or HTTP2 traffic, specifying a timeout of 10s means that backends have 10 seconds to respond to the load balancer's requests. The load balancer retries the HTTP GET request one time if the backend closes the connection or times out before sending response headers to the load balancer. If the backend sends response headers or if the request sent to the backend is not an HTTP GET request, the load balancer does not retry. If the backend does not reply at all, the load balancer returns a 502 Bad Gateway error to the client.

If the protocol is SSL or TCP, timeout is an idle timeout.

The full range of timeout values allowed is 1 - 2,147,483,647 seconds.

--tracking-mode=TRACKING_MODE

Specifies the connection key used for connection tracking. The default value is PER_CONNECTION. Applicable only for backend service-based network load balancers and internal TCP/UDP load balancers as part of a connection tracking policy. For details, see: Connection tracking mode for internal TCP/UDP load balancing and Connection tracking mode for network load balancing. TRACKING_MODE must be one of: PER_CONNECTION, PER_SESSION.

At most one of these can be specified:

--bypass-cache-on-request-headers=BYPASS_CACHE_ON_REQUEST_HEADERS

Bypass the cache when the specified request headers are matched - e.g. Pragma or Authorization headers. Up to 5 headers can be specified.

The cache is bypassed for all cdnPolicy.cacheMode settings.

Note that requests that include these headers will always fill from origin, and may result in a large number of cache misses if the specified headers are common to many requests.

Values are case-insensitive.

The header name must be a valid HTTP header field token (per RFC 7230).

For the list of restricted headers, see the list of required header name properties in How custom headers work.

A header name must not appear more than once in the list of added headers.

--no-bypass-cache-on-request-headers

Remove all bypass cache on request headers for the backend service.

At most one of these can be specified:

--cache-key-query-string-blacklist=[QUERY_STRING,…]

Specifies a comma separated list of query string parameters to exclude in cache keys. All other parameters will be included. Either specify --cache-key-query-string-whitelist or --cache-key-query-string-blacklist, not both. '&' and '=' will be percent encoded and not treated as delimiters. Can only be applied for global resources.

--cache-key-query-string-whitelist=QUERY_STRING,[…]

Specifies a comma separated list of query string parameters to include in cache keys. All other parameters will be excluded. Either specify --cache-key-query-string-whitelist or --cache-key-query-string-blacklist, not both. '&' and '=' will be percent encoded and not treated as delimiters. Can only be applied for global resources.

At most one of these can be specified:

--client-ttl=CLIENT_TTL

Specifies a separate client (for example, browser client) TTL, separate from the TTL for Cloud CDN's edge caches.

This allows you to set a shorter TTL for browsers/clients, and to have those clients revalidate content against Cloud CDN on a more regular basis, without requiring revalidation at the origin.

The value of clientTtl cannot be set to a value greater than that of maxTtl, but can be equal.

Any cacheable response has its max-age/s-maxage directives adjusted down to the client TTL value if necessary; an Expires header will be replaced with a suitable max-age directive.

The maximum allowed value is 31,622,400s (1 year).

When creating a new backend with CACHE_ALL_STATIC and the field is unset, or when switching to that mode and the field is unset, a default value of 3600 is used.

When the cache mode is set to "USE_ORIGIN_HEADERS", you must omit this field.

--no-client-ttl

Clears client TTL value.

At most one of these can be specified:

--custom-request-header=CUSTOM_REQUEST_HEADER

Specifies a HTTP Header to be added by your load balancer. This flag can be repeated to specify multiple headers. For example:

gcloud compute backend-services update NAME             --custom-request-header "header-name: value"             --custom-request-header "another-header:"

--no-custom-request-headers

Remove all custom request headers for the backend service.

At most one of these can be specified:

--custom-response-header=CUSTOM_RESPONSE_HEADER

Custom headers that the external HTTP(S) load balancer adds to proxied responses. For the list of headers, see Creating custom headers.

Variables are not case-sensitive.

--no-custom-response-headers

Remove all custom response headers for the backend service.

At most one of these can be specified:

--default-ttl=DEFAULT_TTL

Specifies the default TTL for cached content served by this origin for responses that do not have an existing valid TTL (max-age or s-maxage).

The default value is 3600s for cache modes that allow a default TTL to be defined.

The value of defaultTtl cannot be set to a value greater than that of maxTtl, but can be equal.

When the cacheMode is set to FORCE_CACHE_ALL, the defaultTtl overwrites the TTL set in all responses.

A TTL of "0" means Always revalidate.

The maximum allowed value is 31,622,400s (1 year). Infrequently accessed objects may be evicted from the cache before the defined TTL.

When creating a new backend with CACHE_ALL_STATIC or FORCE_CACHE_ALL and the field is unset, or when updating an existing backend to use these modes and the field is unset, a default value of 3600 is used. When the cache mode is set to "USE_ORIGIN_HEADERS", you must omit this field.

--no-default-ttl

Clears default TTL value.

At most one of these can be specified:

--global

If set, the backend service is global.

--region=REGION

Region of the backend service to update. Overrides the default compute/region property value for this command invocation.

At most one of these can be specified:

--global-health-checks

If set, the health checks are global.

--health-checks-region=HEALTH_CHECKS_REGION

Region of the health checks to operate on. If not specified, you might be prompted to select a region (interactive mode only).

To avoid prompting when this flag is omitted, you can set the compute/region property:

gcloud config set compute/region REGION

A list of regions can be fetched by running:

gcloud compute regions list

To unset the property, run:

gcloud config unset compute/region

Alternatively, the region can be stored in the environment variable CLOUDSDK_COMPUTE_REGION.

At most one of these can be specified:

--max-ttl=MAX_TTL

Specifies the maximum allowed TTL for cached content served by this origin.

The default value is 86400 for cache modes that support a max TTL.

Cache directives that attempt to set a max-age or s-maxage higher than this, or an Expires header more than maxTtl seconds in the future, are capped at the value of maxTtl, as if it were the value of an s-maxage Cache-Control directive.

A TTL of "0" means Always revalidate.

The maximum allowed value is 31,622,400s (1 year). Infrequently accessed objects may be evicted from the cache before the defined TTL.

When creating a new backend with CACHE_ALL_STATIC and the field is unset, or when updating an existing backend to use these modes and the field is unset, a default value of 86400 is used. When the cache mode is set to "USE_ORIGIN_HEADERS" or "FORCE_CACHE_ALL", you must omit this field.

--no-max-ttl

Clears max TTL value.

At most one of these can be specified:

--[no-]negative-caching

Negative caching allows per-status code cache TTLs to be set, in order to apply fine-grained caching for common errors or redirects. This can reduce the load on your origin and improve the end-user experience by reducing response latency.

Negative caching applies to a set of 3xx, 4xx, and 5xx status codes that are typically useful to cache.

Status codes not listed here cannot have their TTL explicitly set and aren't cached, in order to avoid cache poisoning attacks.

HTTP success codes (HTTP 2xx) are handled by the values of defaultTtl and maxTtl.

When the cache mode is set to CACHE_ALL_STATIC or USE_ORIGIN_HEADERS, these values apply to responses with the specified response code that lack any cache-control or expires headers.

When the cache mode is set to FORCE_CACHE_ALL, these values apply to all responses with the specified response code, and override any caching headers.

Cloud CDN applies the following default TTLs to these status codes:

• HTTP 300 (Multiple Choice), 301, 308 (Permanent Redirects): 10m
• HTTP 404 (Not Found), 410 (Gone), 451 (Unavailable For Legal Reasons): 120s
• HTTP 405 (Method Not Found), 421 (Misdirected Request), 501 (Not Implemented): 60s

These defaults can be overridden in cdnPolicy.negativeCachingPolicy.

Use --negative-caching to enable and --no-negative-caching to disable.

--no-negative-caching-policies

Remove all negative caching policies for the backend service.

--negative-caching-policy=[[CODE=TTL],…]

Sets a cache TTL for the specified HTTP status code.

NegativeCaching must be enabled to config the negativeCachingPolicy.

If you omit the policy and leave negativeCaching enabled, Cloud CDN's default cache TTLs are used.

Note that when specifying an explicit negative caching policy, make sure that you specify a cache TTL for all response codes that you want to cache. Cloud CDN doesn't apply any default negative caching when a policy exists.

CODE is the HTTP status code to define a TTL against. Only HTTP status codes 300, 301, 308, 404, 405, 410, 421, 451, and 501 can be specified as values, and you cannot specify a status code more than once.

TTL is the time to live (in seconds) for which to cache responses for the specified CODE. The maximum allowed value is 1800s (30 minutes), noting that infrequently accessed objects may be evicted from the cache before the defined TTL.

At most one of these can be specified:

--serve-while-stale=SERVE_WHILE_STALE

Serve existing content from the cache (if available) when revalidating content with the origin; this allows content to be served more quickly, and also allows content to continue to be served if the backend is down or reporting errors.

This setting defines the default serve-stale duration for any cached responses that do not specify a stale-while-revalidate directive. Stale responses that exceed the TTL configured here will not be served without first being revalidated with the origin. The default limit is 86400s (1 day), which will allow stale content to be served up to this limit beyond the max-age (or s-max-age) of a cached response.

The maximum allowed value is 604800 (1 week).

Set this to zero (0) to disable serve-while-stale.

--no-serve-while-stale

(DEPRECATED) Clears serve while stale value.

The --no-serve-while-stale option is deprecated and will be removed in an upcoming release; use --serve-while-stale instead. If you're currently using this argument, you should remove it from your workflows.

At most one of these can be specified:

--service-bindings=SERVICE_BINDING,[…]

List of service bindings to be attached to this backend service. Can only be set if load balancing scheme is INTERNAL_SELF_MANAGED. If set, lists of backends and health checks must be both empty.

--no-service-bindings

No service bindings should be attached to the backend service.

Run $ gcloud help for details.

gcloud alpha compute backend-services update

gcloud beta compute backend-services update